// Copyright (c) 2010 SuccessFactors, Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
//
//     * Redistributions of source code must retain the above
//       copyright notice, this list of conditions and the following
//       disclaimer.
//
//     * Redistributions in binary form must reproduce the above
//       copyright notice, this list of conditions and the following
//       disclaimer in the documentation and/or other materials
//       provided with the distribution.
//
//     * Neither the name of the SuccessFactors, Inc. nor the names of
//       its contributors may be used to endorse or promote products
//       derived from this software without specific prior written
//       permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
// COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
// INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
// HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
// OF THE POSSIBILITY OF SUCH DAMAGE.

package org.owasp.jxt;

import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.net.URLClassLoader;

/**
 * JxtLoader
 *
 * @author Jeffrey Ichnowski
 * @version $Revision: 8 $
 */
final class JxtLoader extends URLClassLoader {

    private ClassLoader _parent;

    public JxtLoader(URL[] urls, ClassLoader parent) {
        super(urls, parent);
        _parent = parent;
    }

    @Override
    public Class<?> loadClass(String name, boolean resolve)
        throws ClassNotFoundException
    {
        Class cls = findLoadedClass(name);

        // check previously loaded classes
        if (cls != null) {
            if (resolve) {
                resolveClass(cls);
            }
            return cls;
        }

        if (!name.startsWith(JxtEngine.JXT_PACKAGE + '.')) {
            // not in our package, have the parent load it
            cls = _parent.loadClass(name);
            if (resolve) {
                resolveClass(cls);
            }
            return cls;
        }

        return findClass(name);
    }

    /** Delegate to parent */
    @Override
    public InputStream getResourceAsStream(String name) {
        InputStream in = _parent.getResourceAsStream(name);
        if (in == null) {
            URL url = findResource(name);
            if (url != null) {
                try {
                    in = url.openStream();
                } catch (IOException e) {
                    in = null;
                }
            }
        }
        return in;
    }

} // JxtLoader
